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Like checkboxes, radio buttons also inherit from Gtk.ToggleButton, so you can use the set_active() method to set the status of a radio button. This action causes the “toggled” signal to be emitted.

For example, if we have 3 radio buttons called radio1, radio2, and radio3 in a group, by default the first one in the group would be selected. If we want to select another one, for example, radio3 instead, we should use: